import java.util.*;
public class Example3_9 {
    public static void main(String args[ ]) {
	Scanner reader = new Scanner(System.in);
	double sum = 0;
	int m = 0;
	while(reader.hasNextDouble()) {
		double x = reader.nextDouble();
		m=m+1;
		sum=sum+x;
	}
	System.out.printf("%d个数的和为%f\n",m,sum);
	System.out.printf("%d个数的平均值是%f\n",m,sum/m);
    }
}
